碱度和内配燃料对赤铁矿球团强度的影响

针对赤铁矿球团强度低的问题，以巴西某赤铁矿精矿为对象，研究了碱度、内配燃料以及它们的相互作用对赤铁矿球团强度的影响。结果表明：制备含镁熔剂性赤铁矿球团时，将碱度控制在0.3~1.2可显著提高预热球团和焙烧球团的抗压强度；制备内配燃料酸性含镁赤铁矿球团时，焦粉配比不超过1.0%可改善预热球团强度而基本不影响焙烧球团强度；制备内配燃料熔剂性含镁赤铁矿球团时，将焦粉配比控制1.5%以内，球团碱度控制在0.9，可显著提高焙烧球团强度。由此可见，制备内配燃料熔剂性含镁球团是改善赤铁矿球团强度的有效途径。

Research on Influence of the Alkalinity and the Fuel Flux to the Intensity of Hematite Pellets

Due to the low intensity of hematite pellets, the influences of the alkalinity, the fuel flux and their interactions on the intensity of hematite pellet were studied, taking a Brazilian hematite concentrate as research target. The results showed that when preparing flux magnesium-bearing hematite pellet, the compression strength of preheated pellets and roasted pellet were significantly improved under the alkalinity of 0.3~1.2.When preparing the acidic magnesium hematite pellet with fuel flux, the intensity of preheated pellets was improved but the compressive strength of roasted pellets were less affected with the coke ratio of less than 1.0%. When preparing the fluxed magnesium hematite pellets with the fuels, the intensity of roasted pellets was greatly improved with the coke ratio of less than 1.5% and pellet alkalinity at 0.9.  Thus, the preparation of fluxed magnesium hematite pellet with fuel is an effective way to improve the intensity of hematite pellets.